Neutrino Flavor Transformation in
Supernovae

Huaiyu DuanUC, San Diego

Neutrino flavor transformation can
be very important for both the explosion and nucleosynthesis in a
core-collapse supernova event. We have studied the coherent neutrino
flavor transformation outside the supernova core a few seconds after the
bounce. We found that neutrino flavor transformation in supernovae can
possess collective features which are absent in the solar neutrino mixing
problem. These collective features can be understood with simple
analytical models and are supported in our recent large-scale numerical
simulations. Neutrino mass hierarchy information might be inferred from
the analyses of future supernova neutrino signals.